Logwood, a thorny tree of Mexico and Central America. It grows 20 to 45 feet (6 to 14 m) high and has crooked, thorny branches. The wood was formerly imported into the United States as logs, explaining the tree's common name.

The logwood is widely grown in the tropics as the source of a purplish-red dye, haematoxylin, obtained from the heartwood. By treating haematoxylin with various chemicals, black, gray, blue, violet, green, and other dyes are obtained. These are used to dye animal products, such as silk, wool, fur, and leather.

The logwood is Haematoxylon campechianum of the pea family, Leguminosae.